Fuel economizer



S. A, BULLOCK FUEL ECONOMIZER Filed Feb. 25. 1926 2 Shts-Sheqt 1 Patented Sept. 21, 1926.

- UNITED stares eart SAMUEL A. BULLOCK, or roar WASHINGTON, NEW irons, AssrsNon TO'ALLY coivr- PANY, INc., or PORT WASHINGTON, NEWYVYORK, A conroBA'rIoN or NEVI Yonx.

FUEL ECONOMIZEE.

Application filed February 25, 1926. Serial No. 90,533.

1y invention relates to means for heat- 1 l ing the air supplied to support combustion -in a furnace,by the waste gases of combusimparting it to the air which supports combustion 1n the furnace.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 rise vertical central section through a furnace, in connection with which my invention is applied; Fig. 2, a horizontal section through the same on the line 22 of 1; Fig. 3, a side view, in elevatioinas seen from the right ,Fig. 4, a vertical longitudinal cen- V tral section, on an enlarged scale, through the heating chamber; Fig. 5, a horizontal section, through the same, on the line 55' of Fig. 1; and, Fig. 6, a vertical transverse section, on the line 6-6 of Fig. 4.

The application, in practice, of my invention, will be herein described as in the specific embodiment thereof which is herein exemplified, in which it isillustrated in connection with a house heating furnace, A, of the ordinary construction, having a grate A an ash pit, A below the grate, and an upper discharge opening for the delivery of the gases of combustion from the fire chamber of the furnace to the chimney flue, A.

An air supply casing, 1, is located above the furnace, A, said casing being preferably, as shown, of rectangular transverse section. A hot gas or heating chamber, 2, of substantially similar form in transverse section, as the casing, 1, but of less height and width, and having a pipe, 2", on its lower side which fits into the discharge opening at the top of the furnace, extends from one end of said casing to within a short distance of the opposite end thereof, spaces, through which the air to be heated, traverses, thus intervening between the top, bottom, sides, and one end of the chamber, 2, and the similarly extend ng walls of the casing, 1. Said spaces constitute an air supply channel, which is divided into continuous upper and lower sections, 2 and 2, by horizontal parti- ,tions,2, said sections communicating at one The interior of the end of thefchamber. chamber, 2, is divided by a longitudinal pari were tition, 2, into upper and lower sections, 2 7

and 2 which communicate, through an opening, 2 at one end of the partitlon, 2 and the upper section of thechamber, 2,

communicates d rectly with the discharge flue, A. I A cold air supplypipe, 3, controlled by a valve,'3 opens 1nto the upper section, 2, of

the air supply channel, near the end thereof which isadjacent to the flue, A, and fur-' ther from the end at which the lower vand upper sections communlcate.

lower section,2 of the supply channel which intervenes between the casing, 1, and the hot gas chan'iber, 2, and leads into the ash pit, Al, said pipe being also connected to a superheatmg chamber, 5, which is of what may be termed anchor form, having a body and a reversely turned arm on each side thereof, and extends transversely 1n the ire chamber of the furnace.

Communication, through the pipe, 4, between the lower section of the supply channel and the. ash. p t, and between said section and the super-' heating chamber, 5, is controlled by a valve,

6, fixed on a pin, 6, and-movable about the axial line thereof, by a; hand wheel or handle,

6. The valve, 6, is of angular or curved sec tion, and is manually admstable into positions in which (a) it reduces the extent of,

or entirely cuts off, communication between thepipe, 4, and the superheating chamber,

5, (6), acts similarly as to communication between the supply channel and the ash pit, (0), permits communication between the pipe, 4, and both the superheating-chamber and ashpit, or, (d), entirely cuts off 'communication between said pipe and both the superheating chamber and the ash .pit.

The heated air is delivered into the fire chamber of the furnace, from the superheating chamber, 5, through perforations, or slots, 5 therein, which may be located, as

shown, in the bottom of the body of said chamber, and in the tops of the arms thereof. r

In the operation of an appliance of the construction substantially as herein set forth, atmospheric air, in regulated quantity, is drawn into the air heating casing, 1, by the natural draft of'the flue of the furnace 70 A hot air supply pipe, 4, opens out oftheon the fuel lI1'.COH1bL1StlOl1 therein, and passes, in successively reversed directions,

through the channels formed by the spaces between said casing and the chamber, 2. In its traverse through said channels, it is sub jected to the heat of the gases of combustion which escape from the fire chamber of the furnace through the pipe, 1 into the chamber, 2, and pass, in successively reversed di rections, through the lower and upper sections, 2 and 2 of said chamber, to the discharge flue, A". s

It will be obvious to those skilled in the art that my invention is structurallyand operatively inexpensive, and that it is read- -ily applicable in connection with furnaces V I claim as my invention and desire to secure by Letters Patent 1. The combination with a heater, comprising afirebox, an ash pit and an outlet for the products of combustion, of a rectangular casing on the top of the heater communicating with said, outlets and having a horizontal partition therein, stopping short of one end of the casing, the space above 1 said partition having an outlet communicating with the chimney, a second rectangular casing surrounding said first casing so as to leave a space between their walls; having horizontal partitions along its sides; an air inlet near the top of one end, and an air outlet from the bottom of said end, and a pipe leading from saidair outlet into the ash-pit. r

2. The combination with a heater, comprising a fire box, an ash-pit and an outlet for the products of combustion, of a rectangular casing on the top of the heater communicating with said outlet and having a horizontal partition therein, stopping short of one end of the casing, the space above said partition having an outlet communicating with the, chimney, a second rectangular casing surrounding said first casing so as to leavea space between their walls having horizontal partitions along its sides; an air inlet near the top of one end, and

an air outlet from the bottomof said end;

an air superheater in the firebox provided with outlet holes, pipe connections between said air outlet, said superheater and the ashpit, and a valve in said connections to con trol the How of heated air.

3. An air-heating attachment for domes tic furnaces, comprising an outer and an inner rectangular casing adapted to be placed above the furnace, a pipe connection leading from the inner casing and adapted to be connected to the outlet flue of the furnace, said inner casing having an outlet for the gases, a pipe connection leading from the outer casing andradapted to be connected to the ashpit of the furnace, said outer casing having a cold air inlet, a superheater adapted to be placed in the firebox of the furnace and to be connected to said outer casing, and valve mechanism to control the flow of air from said outer casing into said superheater and ashpit.

SAMUEL A. BULLOCK. 

